If you have a MULF unit, you MUST use the Y-cable! If you have a combox, you can use the original apple cable.

Try this before you buy the newest ipod. plug the ipod 4th gen using the apple "white" cable (this one would be the large adapter one). IF it works, then you can do the same thing with the 5th gen ipod.

If the ipod only works with the BMW Black Y Cable, then you will need to use a y-cable as well. I believe if you put the 30 pin to lightning adapter on the Bmw black y cable, it should work as well but don't quote me on that.